Derivative Financial Instruments - Net Realized Gains (Losses) (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Derivatives, Fair Value [Line Items]
Net investment income	$ 2,318	$ 2,074	$ 2,159
Net gains (losses)	(130)	(27)	(72)
Gain (loss) reclassified from AOCI into income	$ (4)	$ 162	$ (11)
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Policyholder benefits, Net gains (losses)	Policyholder benefits, Net gains (losses)	Policyholder benefits, Net gains (losses)
Fixed maturities
Derivatives, Fair Value [Line Items]
Gain (loss) reclassified from AOCI into income	$ 5	$ (6)	$ (1)
Within reinsurance agreements
Derivatives, Fair Value [Line Items]
Gain (loss) reclassified from AOCI into income	(3)	(3)	(37)
Within reinsurance agreements \| Level 3 \| Assets measured on recurring basis
Derivatives, Fair Value [Line Items]
Fair Value, Assets and Liabilities Measured on Recurring Basis, Gain (Loss) Included in Earnings	2	2	2
Net Income	13	(1)	0
Managed Custody Guarantees
Derivatives, Fair Value [Line Items]
Net gains (losses)	4	4	(2)
Gain (loss) reclassified from AOCI into income	4	4	(2)
Stabilizer and MCGs
Derivatives, Fair Value [Line Items]
Net gains (losses)	10	(14)	(1)
Gain (loss) reclassified from AOCI into income	10	(14)	(1)
Not Designated as Hedging Instrument \| Credit Default Swap
Derivatives, Fair Value [Line Items]
Gain (loss) reclassified from AOCI into income	(1)	1	1
Not Designated as Hedging Instrument \| Interest rate contracts
Derivatives, Fair Value [Line Items]
Gain (loss) reclassified from AOCI into income	(42)	170	15
Not Designated as Hedging Instrument \| Foreign exchange contracts
Derivatives, Fair Value [Line Items]
Gain (loss) reclassified from AOCI into income	7	(8)	0
Not Designated as Hedging Instrument \| Equity contracts
Derivatives, Fair Value [Line Items]
Gain (loss) reclassified from AOCI into income	16	18	14
Other Comprehensive Income (Loss) \| Designated as Hedging Instrument \| Cash Flow Hedging \| Interest rate contracts
Derivatives, Fair Value [Line Items]
Other Comprehensive Income (Loss), before Reclassifications, before Tax	0	0	0
Other Comprehensive Income (Loss) \| Designated as Hedging Instrument \| Cash Flow Hedging \| Foreign exchange contracts
Derivatives, Fair Value [Line Items]
Other Comprehensive Income (Loss), before Reclassifications, before Tax	(54)	18	(43)
Net Investment Income \| Fair Value Hedging \| Interest rate contracts
Derivatives, Fair Value [Line Items]
Gain (loss) reclassified from AOCI into income	0	0	0
Net Investment Income \| Fair Value Hedging \| Foreign exchange contracts
Derivatives, Fair Value [Line Items]
Gain (loss) reclassified from AOCI into income	0	0	0
Net Investment Income \| Designated as Hedging Instrument \| Cash Flow Hedging \| Interest rate contracts
Derivatives, Fair Value [Line Items]
Amount of Gain or (Loss) Recognized on Other Comprehensive Income / Reclassified from Accumulated Other Comprehensive Income	0	0	0
Net Investment Income \| Designated as Hedging Instrument \| Cash Flow Hedging \| Foreign exchange contracts
Derivatives, Fair Value [Line Items]
Amount of Gain or (Loss) Recognized on Other Comprehensive Income / Reclassified from Accumulated Other Comprehensive Income	8	16	10
Gain (loss) reclassified from AOCI into income	6	10	10
Net Investment Income \| Designated as Hedging Instrument \| Fair Value Hedging \| Interest rate contracts
Derivatives, Fair Value [Line Items]
Gain (loss) reclassified from AOCI into income	0	0	0
Net Investment Income \| Designated as Hedging Instrument \| Fair Value Hedging \| Foreign exchange contracts
Derivatives, Fair Value [Line Items]
Gain (loss) reclassified from AOCI into income	0	0	0
Other net realized capital gains/losses \| Fair Value Hedging \| Interest rate contracts
Derivatives, Fair Value [Line Items]
Gain (loss) reclassified from AOCI into income	0	2	0
Other net realized capital gains/losses \| Fair Value Hedging \| Foreign exchange contracts
Derivatives, Fair Value [Line Items]
Gain (loss) reclassified from AOCI into income	14	(6)	3
Other net realized capital gains/losses \| Designated as Hedging Instrument \| Cash Flow Hedging \| Foreign exchange contracts
Derivatives, Fair Value [Line Items]
Gain (loss) reclassified from AOCI into income	2	6	0
Other net realized capital gains/losses \| Designated as Hedging Instrument \| Fair Value Hedging \| Interest rate contracts
Derivatives, Fair Value [Line Items]
Gain (loss) reclassified from AOCI into income	0	(2)	0
Other net realized capital gains/losses \| Designated as Hedging Instrument \| Fair Value Hedging \| Foreign exchange contracts
Derivatives, Fair Value [Line Items]
Gain (loss) reclassified from AOCI into income	$ (12)	$ 8	$ (1)

Amount of increase (decrease) in the fair value of derivatives recognized in the income statement.

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Amount of gain (loss) recognized in income from derivative asset (liability) after deduction of derivative liability (asset), measured at fair value on recurring basis using unobservable input (level 3).

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Amount, after investment expense, of income earned from investments in securities and real estate. Includes, but is not limited to, real estate investment, policy loans, dividends, and interest. Excludes realized gain (loss) on investments.

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